Alien X only has 2 useful abilities. Mind Control and Reality Warping.
Browser has a shit ton of had such as Sealing, Transmutation, Plot Manipulation, Empathic Manipulation, Curse Manipulation, Body Puppetry, etc...it all depends on who uses what first. I need to think on this.
Bowser resists existence erasure, so X can’t just think him out of existence. Pretty sure he lost to Eggman due to Mind haxing. So I guess he can plot hax? But even still I don’t know how potent his plot hax is.